Journal for printing cylinder



R. REINARTZ JOURNAL FOR PRINTING CYLINDER I Feb. 24, 1959 2 Sheets-Shet 1 Filed Jan. 17, 1956 Fig. 2. (MM) Feb. 24, 1959 R. REINARTZ 2,874,635 JOURNAL FOR PRINTING CYLINDER.

Filed Jan. 17, 1956 2 Sheets-Sheet 2 3 5 6}? aim :3"

United States. Patent JOURNAL FOR PRINTING CYLINDER Robert Reinartz, Augsburg, Germany, assignor to Maschinenfabrik Augsburg-Numberg, A. G., Augsburg, Germany Application January 17, 1956, Serial No. 559,685

Claims priority, application Germany February 11, 1955 1 Claim. (Cl. 101-216) This invention relates to a journal for a printing cylinder. In particular, the invention relates to a journal bearing for the intermediate cylinder of a two-color offset printing press.

Customarily, the intermediate cylinder is journalled in ball bearings set in the frame or side wall of the driving side of the press. This construction has the disadvantage in that the cylinder shaft moves or even sags because of the play inherent in the ball bearings. While such movement of the shaft may be of no consequence in ordinary printing presses, yet it is very detrimental to the securing of an accurate register in two-color offset printing presses.

The object of this invention is to produce a journal bearing for the printing cylinder which is not subject to such movement as will interfere with accurate register.

. In general, the object is obtained by mounting a sleeve bearing in the printing press frame on the drive side thereof. The cylinder shaft mounted in said bearing is secured against axial displacement by a ring-grooved bearing and drives the cylinder drive gear through a connecting member, said drive gear being rotatably mounted on the sleeve hearing. This construction prevents the shaft from sagging and from axial displacement.

The means by which the object of the invention is obtained is described more fully with reference to the accompanying drawings, in which:

Figure 1 is a schematic diagram of a two-color offset printing press;

Figure 2 is a cross-sectional view through a conventional bearing for the drive shaft for a printing cylinder; and

Figure 3 is a cross-sectional view through a bearing constructed according to this invention.

In Figure 1, the two-color printing press is composed of two printing stands supporting the plate cylinders 1, the offset cylinders 2, and the-printing cylinders 3. The cylinders of the two stands are joined by the intermediate cylinder 4. Feed rollers 5 serve for feeding the printing sheets to the press.

In Figure 2, the drive shaft 7 is journalled in frame 8 by means of ball bearing 9 and a roller bearing ltl, the outer races of which are secured to a sleeve 11 extending through the frame. Gear body 12 having tooth rim 2,874,635 Patented Feb. 24, 1959 ice 13 is fastened by key 12a to shaft 7. In this journal bearing, the difficulty lies in that the shaft will sag when transmitting a great gyroscopic movement, or will axially shift, so that it is difiicult to maintain a proper register in'the printing press.

These disadvantages are overcome in the bearing of this invention as shown in Figure 3. A sleeve bearing 14 is mounted in frame 8 and secured thereto by bolt 16. This sleeve has a portion extending transversely beyond and in a direction outside of frame 8. Stepdown shaft 7 is journalled in bearing 14. A flange collar 18 is secured to the free end of shaft 7 by key 20, and the flange 22 secured by bolt 24 to gear body 26 having a tooth rim 28. Gear body 26 is provided with a bearing sleeve 30, which is rotatably mounted on the outer surface of sleeve bearing 14. Flange collar 18 is secured to the end of shaft 7 by lock nut 32.

In order to prevent an axial displacement of shaft 7, it is secured in sleeve bearing 14 by means of two grooved-roller bearings 34 and 36, respectively. The races of roller bearing 34 abut flange collar 18 and are held against axial displacement by lock nut 38. The races for roller bearing 36 abut a shoulder within sleeve bearing 14 and a shoulder 40 on shaft 7.

In operation, when shaft 7 turns, it rotates within bearing 14 and drives gear body 26 through flange collar 18, sleeve bearing 14 being held stationary by bolt 16. Gear body 26 rotates through sleeve 30 on the outer surface of sleeve bearing 14. Sleeve bearing 14 presents such additional rigidity as to keep the shaft from sagging, and roller bearings 34 and 36 prevent axial displacement of shaft 7.

Although the invention is particularly described for the bearing of an intermediate cylinder, the invention can be employed with equal success to other printing cylinder bearings, such as those for the feeding cylinders and the like.

Having now described the means by which the object of the invention is obtained, I claim:

A bearing for an intermediate cylinder of a two-color offset printing press having a press frame, a sleeve bearing mounted in said'frame and having a portion extending transversely beyond and in a direction outside said frame and secured against axial movement, a cylinder shaft journalled in said sleeve bearing, grooved-roller bearing means for securing said shaft from axial movement in said sleeve bearing, a cylinder drive gear journalled on the extending portion of said sleeve and means joining said shaft to said gear.

References Cited in the file of this patent UNITED STATES PATENTS 1,584,828 Wood May 18, 1926 2,660,115 Ras Nov. 24, 1953 FOREIGN PATENTS 556,525 France July 21, 1923 

